LBE Unlimited was developed to answer the needs of Elite Task Force team's world wide who demand top performing gear with no room for error. Whether you are shooting in combat, competition or practice chose the gear that will not fail under pressure, LBE Unlimited. This particular LBE Unlimited part is a must have for the modern gun builder or shooting enthusiast. Great as a spare, or perfect for your next build this complete AR-15 bolt carrier group features a bolt, carrier, and a Nickel Boron Coated finish.